EPA Environmental Dataset Gateway


Open/Close section Identification Information
Title: EPA Region 1 - Valley Depth in Meters
Abstract: Raster of the Depth in meters of EPA-delimited Valleys in Region 1. Valleys (areas that are lower than their neighbors) were extracted from a Digital Elevation Model (USGS, 30m) by finding the local average elevation, subtracting the actual elevation from the average, and selecting areas where the actual elevation was below the average. The landscape was sampled at seven scales (circles of 1, 2, 4, 7, 11, 16, and 22 km radius) to take into account the diversity of valley shapes and sizes. Areas selected in at least four scales were designated as valleys.
Purpose: Studies (e.g., J.G. Su et al., Air Qual Atmos Health (2013) 6:85-94) have shown a correlation between areas with higher population and lower topography in New York and New England with elevated air pollution, especially from wood smoke, during winter air inversions. To take advantage of these study results, we developed a regional digital model (i.e., map) that defines valleys and highlights populated valleys in a consistent manner throughout New England. This model uses publicly available topography and population data and can be replicated in other US regions or states. This tool is intended for use by managers to help with planning air-quality monitoring, outreach, and mitigation. For example, the tool may be used to identify valleys at risk for wood-smoke pollution, to review locations of existing air-quality monitors and to identify potential new monitoring sites, to prioritize areas for woodstove changeouts or other woodsmoke mitigation or outreach efforts, or for planning routes for mobile air-quality monitoring.
Open/Close section Distribution Information
Resource(Server) URL: https://edg.epa.gov/
Download URL: https://edg.epa.gov/data/Public/R1/ValleyService.gdb.zip
Reference URL: https://www.epa.gov/aboutepa/epa-region-1-new-england
Open/Close section Time Period of Content
Publication Date: 20160526
Progress: Completed
Frequency: notPlanned
Open/Close section Single Date
Date: 20160526
Currentness: Publication date
Open/Close section Spatial Domain
West Bounding Longitude: -73.725238
East Bounding Longitude: -66.969271
North Bounding Latitude: 47.453335
South Bounding Latitude: 40.998392
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Open/Close section Constraints
License https://edg.epa.gov/EPA_Data_License.html
Access: None
Use: None. Please check sources, scale, accuracy, currency and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
Open/Close section Theme Keywords
Theme Topics: Environment and Conservation
Open/Close section Contact Information
Originator: US Environmental Protection Agency
Email: dichter.alexandra@epa.gov
Address Type: mailing and physical address
City: Boston
State: MA
Postal Code: 02109
Telephone: (617) 918-1142
Open/Close section Metadata Reference Information
Metadata Date Stamp: 2016-06-10
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998